Support basic debug mode with upstream CLI snapshot builds

As an OSCAL developer, in order to test pre-release changes with new features and bug fixes without locally building a new snapshot release of `oscal-cli`, I want an addition to `npx oscal use ...` like `npx oscal use --snapshot XXXX ...` or `npx oscal use --snapshot-latest XXXX ...` to use that and install it for me in place of having to do so manually. This would be very effective for integration testing in CI/CD.

I am willing to help develop this change if maintainers and users are welcome to it.

Start from the `npx oscal use ...` CLI entry point and inspect how it currently selects and installs `oscal-cli` releases. Define how `--snapshot XXXX` and `--snapshot-latest XXXX` should resolve and install upstream builds for CI/CD; done means both forms replace the manual installation workflow.

Written by the indexing model from the issue text.